From: Bjorn Helgaas <bhelgaas@google.com>
Date: Thu, 23 Jun 2016 21:32:20 +0000 (-0500)
Subject: MIPS/PCI: Claim bus resources on PCI_PROBE_ONLY set-ups
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=046136170a56ba47338fbd10fdf4db4214b30567;p=linux-beck.git

MIPS/PCI: Claim bus resources on PCI_PROBE_ONLY set-ups

We claim PCI BAR and bridge window resources in pci_bus_assign_resources(),
but when PCI_PROBE_ONLY is set, we treat those resources as immutable and
don't call pci_bus_assign_resources(), so the resources aren't put in the
resource tree.

When the resources aren't in the tree, they don't show up in /proc/iomem,
we can't detect conflicts, and we need special cases elsewhere for
PCI_PROBE_ONLY or resources without a parent pointer.

Claim all PCI BAR and window resources in the PCI_PROBE_ONLY case.

If a PCI_PROBE_ONLY platform assigns conflicting resources, Linux can't fix
the conflicts.  Previously we didn't notice the conflicts, but now we will,
which may expose new failures.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---

diff --git a/arch/mips/pci/pci.c b/arch/mips/pci/pci.c
index 5717384a986d..b4c02f29663e 100644
--- a/arch/mips/pci/pci.c
+++ b/arch/mips/pci/pci.c
@@ -112,7 +112,14 @@ static void pcibios_scanbus(struct pci_controller *hose)
 		need_domain_info = 1;
 	}
 
-	if (!pci_has_flag(PCI_PROBE_ONLY)) {
+	/*
+	 * We insert PCI resources into the iomem_resource and
+	 * ioport_resource trees in either pci_bus_claim_resources()
+	 * or pci_bus_assign_resources().
+	 */
+	if (pci_has_flag(PCI_PROBE_ONLY)) {
+		pci_bus_claim_resources(bus);
+	} else {
 		pci_bus_size_bridges(bus);
 		pci_bus_assign_resources(bus);
 	}